Stop Armour:
There is no way to check your levels or keep your thyroid in control in your current regimen. Armour thyroid is ground up pigs. Switch to brand name T4 only and get it regulated. Also, have repeat thyroid biopsy with afirma test and consider surgery to remove nodule depending upon lab and ultrasound.
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A TSH test measures the amount of thyroid stimulating hormone (TSH) in your blood. TSH is produced by the pituitary gland and tells the thyroid gland to make and release the hormones thyroxine (T4) and triiodothyronine (T3).
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4

It depends:
Are you taking thyroid hormone? If yes, it changes how the tests are interpreted. If you are not on thyroid medication, a low free T4 and low TSH can indicate a pituitary disorder.
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5

Unlikely but...:
Rhodiola is known to improve thyroid function and thus might be expected to reduce TSH levels somewhat (though more research on this is needed). However, a low TSH tends to be a sign of hyperthyroidism and, as far as i know, rhodiola is not known to stimulate the thyroid to the point of hyperthyroidism.
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6

Need to look at T3 (liothyronine):
And free t4. Low tsh, depending on the sensitivity of the assay, indicates thyroid hyper-function. However, the suspected hyperthyroidism needs to be confirmed with high levels of T3 (liothyronine) and free t4. All lab tests need to be evaluated in the clinical context and it would be prudent to take up the issue with your doctor.
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9

Low TSH unlikely:
Thyroid cancer usually does not cause a low TSH (unless you are taking thyroid hormone). Most thyroid cancers do not function as well as normal thyroid tissue. Elevated thyroglobulin is a nonspecific finding, seen in most disorders of the thyroid. It can serve as a tumor marker for recurrent thyroid cancer as long as the thyroid has been completely removed. High tg has nothing to do with tsh.
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